That's a very good point!
I might counter-argue that at some point there's no doubt and being permanently removed from the pool of people who are alive might be OK.
What I mean is that if someone is attempting to murder me and I manage to kill them first that it was a justifiable homicide and that I shouldn't be punished in any way. That's in the law and it even makes sense to a great many people even if they're not lawyers, and even if they don't know the finer points of the law. In that situation there is no doubt, or perhaps no reasonable doubt and the law does effectively judge people to be competent to make precisely that decision.
Part of what makes this so difficult is that she actually wielded vast power due to her position. In many ways she was far, far more powerful than a judge or a prosecutor. A judge can't just unilaterally accuse someone of a worse crime just because, nor can a prosecutor reasonably trump charges up too much without getting called out for bad behavior. But it seems that this lady did precisely that, totally perverting justice.
If an accountant cooks the books it might be professional misconduct (and criminal!) and people might lose their jobs and all of that is terrible. But that accountant can't somehow make all the employees of the company go to jail by doing something wrong.
The power that this lady had and the extent to which she abused it is simply breathtaking.